| 摘要 |
PROBLEM TO BE SOLVED: To provide an underground heat exchanger capable of preventing positional deviation and deformation of a heat medium pipe in assembly.SOLUTION: An underground heat exchanger includes a first cylindrical casing 11 having a slit 40 extending over the entire length in a longer direction and generating an energization force outward in a radial direction, a second cylindrical casing 12 arranged outside the first cylindrical casing 11 in the radial direction, and a first heat medium pipe 21 made from resin and held between the first cylindrical casing 11 and the second cylindrical casing 12. |
